Improvement in rotary boilers for boiling and steaming paper-stock



vJ. THORPE. Rotary-Bpiler forl Boilng and Steamng Paper-Stock..

No. 206,277. Patented `July 23, 1878.

INVBNTOR ATTORNEYS.

N.PETERS, PHOTO-LITHDGRAPHER. WASHINGTON. D c.

UNrlFil'.)v STATES PATENT OFFICE.

.IOIIhT TIIORIE, OF FORT' MILLE t, NEWv YORK.

IMPROVEMENT IN ROTARY BOILERS FORVBOILING AND STEAMING PAPER-STOCK..

Specification forming part oi Letters Patent No. 206,277, dated July 23, 1878,' application filed June 6, 1878..

To all whom it may concern:

Be it known that I, JOHN THORPE, of Fort Miller, in the county of Tashington and State of New York, have invented a new and useful Improvement in Rotary Boilers for Boiling and Steaming Paper-Stock Material, &c., of which following is a" specification:

In boiling and steaming paper-stock material, it is usual to place the material in a boiler tightly closed, and the boiler is hung on bearings and revolved, to keep the mass in motion. Steam is admitted by pipes leading to the inside of the boiler, for the purpose of mixing up and agi tat-in g the material as well as boiling and steaming. It is necessary that the mateterial should be uniformly and thoroughly steamed or boiled, to render it in proper condition for making paper-pulp.

The object of my invention is to accomplish the purposes above named in a more uniform and thorough manner, and with a great saving" of time over the means heretofore employed.

I employ a boiler mounted on axles in suit able bearings and with the steam-suppl y pipe passing through the center of one or both of the axles and into the end ofthe boiler. Two distributing steam-pipes pass from the end of the supply steam-pipe and extend lengthwise of the boiler, near the sides thereof, and at opposite sides, so that as the boiler turns the distributing-pipes turn with it, and one or the other of them is in the material at all times. A cut-oill is placed at the end ot the steamsupply pipe, and the motion of the boileris availed of to permit the steam to enter the distributing-pipe that is submerged in the material and cut it ott' from the other distributin g-pipe.

In the drawing, Figure l is a vertical section of one end of a rotary boiler with my improvement attached. Fig. 2 is a cross-section through the end of the steam-supply pipe and valve.

Similar letters of reference indicate corresponding parts.

a is the shell of the boiler, and b the head. c is the axle on which the boiler revolves, and this axle c is shown as made in one piece with the head b. d is the steam-supply pipe, passing through the hollow axle c, and there is a stuffing-box, c, at the end of the axle c, through which the pipe d passes. The pipe d enters a short distance into the boiler, and terminates within the steam-cylinder f, which is bolted fast to the head b of the boiler.

g g are the steam-distributing pipes, which are bolted to the shell a of the boiler, at opposite sides, and are connected with the steamcylinder j'. The pipes g g extend the whole length of the boiler, and are provided with perforations h h, to admit steam to the boiler, and at the ends of these pipes g g there are cone plugs 'i that enable the distributing-pipes to be blown out, to clear them of line pieces of stock.

7s is a cut-oli', formed as a small cylinder, with an opening at l. This cut-off is screwed fast upon the end of the steam-pipe d, and is contained within the steam-cylinder j'.

The operation is as follows: The paper-stock or other material is placed within 'the boiler, through a man-hole or in any other manner, and the boiler closed. The boiler is then revolved by the usual means, and steam is admitted to the supply-pipe el and passes into the cylinderf. The boiler, in its revolution, carries with it the distributing-pipes g g', and the steam-cylinderf turns upon the cut-off k, brin ging the ends of the pipes g 0' alternately opposite the opening l in the eut-oft k, thus gradually cutting off the steam from one distributing-pipe and admitting it gradually to the other. The opening lis upon the under side, so that the steam is always passing into the pipe that is in the liquor or material contained within the boiler.

If there was but one distributing-pipe, the steam would be blown into space whenever, by the revolution of the boiler, that pipe was out of the material, and there would be awaste of time and steam.

The pipes g g act as agitators, stirring and lifting the materia-l and allowing the steam to permeate the whole mass.

There may be a steam-supply pipe at each e1 id of the boiler, with a cutoff and distributing pipes, as described, in which case the pipes g g need not extend the whole length of the boiler. f

I do not limit myself to the precise oonstruetion of the parts as herein set forth, as they may be varied Without departing from my invention. The form of cut-oila may be changed, and other devices substituted to aeeoniplish the same object.

Having thus described my invention I claim as new and desire to secure by Letters Pat entl. The distributing -pipes g g', in combination with the supply-pipe d and a cut-oli', substantially as and for the purposes set forth.

2. The steam-supply pipe (1 passing through the hollow axle of the boiler, the steam-cylinder f, revolving with the boiler and carryingthe distributing-pipes g g', and a cut-01T to admit steam to the distributing-pipes alternately, combined and arranged substantially as set forth.

3. The cone plugs i at the ends of the distribluting steam-pipes, for the purposes set fort JOHN THORPE.

Vitnesses:

GEO. W. LEWTHWAITE, JOHN WAGMAN. 

